I need to display a dynamic amount of QGraphicsRectItems in a QGraphicsView in rows and columns, so I decided to create a 2D array, but I always get an error. This is my header:

Qt Code: 
  1. #ifndef MAINWINDOW_H
  2.     #define MAINWINDOW_H
  3.  
  4.     #include <QGraphicsRectItem>
  5.     #include <QMainWindow>
  6.     #include <QGraphicsScene>
  7.  
  8.     namespace Ui{
  9.         class MainWindow;
  10.     }
  11.  
  12.     class MainWindow : public QMainWindow{
  13.         Q_OBJECT        
  14.  
  15.         public:
  16.             explicit MainWindow(QWidget *parent = 0);
  17.             ~MainWindow();
  18.  
  19.         private:
  20.             Ui::MainWindow *ui;
  21.             QGraphicsRectItem*** objRect; //This would be my 2D array
  22.     };
  23.  
  24.     #endif // MAINWINDOW_H
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This is how I instance it:

Qt Code: 
  1. objRect = new QGraphicsRectItem**[x];
  2.         for(int i = 0; i < x; i++){
  3.             objRect[i] = new QGraphicsRectItem*[x];
  4.         }
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The code above runs perfectly with no errors. But whenever I try to do something with it, like establishing the size of one of the rectangles, it throws me an error message:

Qt Code: 
  1. objRect[0][0]->setRect(0,0,100,100);
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If I run the program normally, no error message appears, but the window doesn't even appear. I can only see the error message if I run the project in Debug mode.

This is the error message:

2017-08-11.jpg

"The inferior stopped because it received a message from the operating system"

Signal name: SIGSEGV

Signal meaning: Segmentation fault

I've tried a lot of different ways of instancing it, but nothing seems to work.